diff --git a/pytec/tec_qt.py b/pytec/tec_qt.py
index 52d16b4..46a4e2c 100644
--- a/pytec/tec_qt.py
+++ b/pytec/tec_qt.py
@@ -42,7 +42,7 @@ class MutexParameter(pTypes.ListParameter):
     def __init__(self, **opts):
         super().__init__(**opts)
 
-        self.sigValueChanged.connect(self._show_chosen_child)
+        self.sigValueChanged.connect(self.show_chosen_child)
         self.sigValueChanged.emit(self, self.opts['value'])
 
     def _get_param_from_value(self, value):
@@ -54,7 +54,7 @@ class MutexParameter(pTypes.ListParameter):
         return self.children()[values_list.index(value)]
 
     @pyqtSlot(object, object)
-    def _show_chosen_child(self, value):
+    def show_chosen_child(self, value):
         for param in self.children():
             param.hide()